APC Symmetra MW Installation Guide download pdf (Page 51)

Residual Current Sense

Mains - input

UPS - output

Bypass - input Bypass - output

Protective Earthing Conductor

Main Protective Earthing Terminal

External SSW-Bypass

Symmetra MW

( PDU )

Service Entrance

Mai n

inverter

Main Protective Earthing Terminal

Earthing arrangements and protective conductors - Symmetra MW in TT installation

Suitable earth electrode: R

x I

< 50V

With reference to IEC 60364-4-41 § 413.1.4.2

Residual current protective device

can be used.

Residual Current Sense

+- +-

Battery 1

Battery 2

Q7 Q8

Battery 1 Battery 2

Battery

rack

Battery

breaker

box

Delta

Inverte r

Common-mode filter

Switchgear

See: IEC 60364-4-41 § 413.1.4

With reference to IEC 60364-4-41 § 413.1.4.1

Residual current protective device can not be

used at this point.

Owing to parallel return path for the fault current

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APC Symmetra MW Installation Guide Page 51